try_catch_finally_in_php.php

<?php
// see https://gist.github.com/1106254 about toClosure() function.
class SpecificException extends Exception {};
class Sample
{
    // Exectute Around Method and try-catch-finally sample in PHP.
    function inLock($callback) {
        $unlock = \toClosure(get_class(), 'unlock', $this);
        $ensure = function() use($unlock) { $unlock(); };
        $this->lock();
        try {
            $callback();
            $ensure();
            return;
        } catch (SpecificException $e) {
            // rescue specific case
            $ensure();
            return;
        } catch (Exception $e) {
            $ensure();
            throw $e;
        }
        throw new Exception('you cannot be here.');
    }
    
    function lock() {
        echo "lock", PHP_EOL;
    }
    
    function unlock() {
        echo "unlock", PHP_EOL;
    }
}

function usage() {
    $obj = new Sample;
    $obj->inLock(
        function() {
            echo "during execution", PHP_EOL; 
        }
    );
}
usage();